Method for Detection of Intestinal, and Blood-Brain Barrier Permeability and Testing Materials Thereto

ABSTRACT

Methods, assays, and apparatus are disclosed for testing of antigens associated with intestinal and/or blood-brain barrier permeability. For example, blood, saliva or other bodily fluid can be tested for binding (1) to a bacterial toxin (preferably a lipopolysaccharide), and (2) binding to tissue antigens selected from at least one of (a) a gut-related antigen and (b) a blood brain barrier-related antigen. Analysis of test results can be used to assist in detecting and diagnosing diseases associated with leaky gut syndrome (whether due to paracellular or transcellular pathways, and whether due to bacterial toxins or some other cause) and/or to diseases associated with excessive blood brain barrier permeability, which are contemplated herein to include both neuroinflammation and/or neuroautoimmunity conditions, and especially amyotrophic lateral sclerosis, Parkinson&#39;s disease, multiple sclerosis, Alzheimer&#39;s, or peripheral neuropathy, and major depression.

This application is a divisional of U.S. patent application Ser. No. 13/359,007, filed on Jan. 26, 2012, which claims the benefit of U.S. Provisional Application No. 61/437,244 filed Jan. 28, 2011, which is incorporated herein in its entirety by reference.

FIELD OF THE INVENTION

The present invention relates to methods, assays, and kits for aid in detection and diagnosis of intestinal and blood-brain barrier permeability.

BACKGROUND OF THE INVENTION

Compared to the other cellular organs in the human body, the intestinal epithelial cells are exposed to an enormous number of antigens that originate from ingested foods, yeast, bacteria and viruses. Some of these bacterial antigens pose no threat to the mucosal immune system, while others may be harmful to the host. The intestinal immune system monitors these bacterial antigens in the intestinal lumen by allowing a few molecules to permeate the epithelium, where they interact with the mucosal and systemic immune system, in order to develop regulatory T-cell function or tolerance for these antigens. However, inappropriate or excessive exposure of the intestinal immune system to these bacterial antigens may cause the breakdown of this regulatory mechanism and lead to gastrointestinal disease (1). Therefore, an understanding of the physiology of the antigen uptake is central to an appreciation of the pathogenesis of disease, including inflammatory and autoimmune reactions (2).

These and all other extrinsic materials discussed herein are incorporated by reference in their entirety. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.

Increased intestinal permeability is thought to be an early stage that precedes the onset of several autoimmune disorders (3-6). For this reason, there has recently been an increased interest in the role of intestinal barrier dysfunction in the pathogenesis of many pathological conditions targeting the GI tract as well as extra-intestinal organs including the nervous system (7). This dysregulation of the intestinal barrier function as the biological doorway to inflammation, autoimmunity and cancer was discussed in a review article by Fasano (7). In this review article, as well as an earlier Fasano article (4), Fasano emphasized that the primary functions of the gastrointestinal tract have traditionally been perceived to be limited to the digestion and absorption of nutrients and to electrolytes and water homeostasis. A more attentive analysis of the anatomic and functional arrangement of the gastrointestinal tract, however, suggests that another extremely important function of this organ is its ability to regulate the trafficking of macromolecules between the environment and the host through a barrier mechanism. Together with the gut-associated lymphoid tissue and the neuroendocrine network, the intestinal epithelial barrier, with its intercellular tight junctions, controls the equilibrium between tolerance and immunity to non-self antigens.

Zonulin/occludin are physiological modulators of paracellular tight junctions that are involved in the trafficking of macromolecules and therefore in the balance between immune response and tolerance (7). When the finely tuned intestinal barrier proteins are dysregulated in those individuals genetically susceptible to environmental factors, the possibility arises for both intestinal disorders such as celiac disease, Crohn's disease and ulcerative colitis, and extra-intestinal autoimmune diseases such as arthritis, lupus, thyroiditis, diabetes, and even multiple sclerosis (MS), malignancies and major depression (8-14). One of the major environmental factors that can contribute to the pathophysiology of gut and brain barrier dysfunction, and hence its involvement in intestinal and extra-intestinal autoimmunities, is bacterial lipopolysaccharides (LPS). Due to gut microbiota dysbiosis and bacterial translocation, LPS is apparently responsible for the activation of toll-like receptors on epithelial cells and activation of an inflammatory cascade which results first in gut barrier and then blood-brain barrier dysfunction (14). The role of LPS in the induction of “leaky gut” and “leaky brain” syndrome is shown in FIG. 1.

FIG. 1 emphasizes that GI tract abnormality can compromise the integrity of the gut barrier and increases the entry of undigested antigens into circulation, thus challenging the immune system. Reaction to these antigens activates immune and inflammatory cascades, resulting in the production of pro-inflammatory cytokines, an array of antibodies, and increased intestinal barrier permeability (or “leaky gut” syndrome). If intestinal barrier dysfunction is left unmanaged, the result could be neuroinflammation, neuroinvasion and neurodegeneration.

Therefore, there is a need for a non-invasive method, apparatus, and assays for the measurement of intestinal permeability to large antigenic molecules that can challenge the immune system, inducing inflammation, which may result in the opening of blood-brain barriers first, followed by neuroinflammation and neurodegeneration thereafter (15-25). These needs and others are met by the present invention.

SUMMARY OF THE INVENTION

The inventive subject matter of the present invention provides apparatus, systems, assays and methods in which a sample from a human being can be tested to assist in detection and diagnosis of intestinal and/or blood-brain barrier permeability

In certain aspects of the present invention, one or more fractions of a sample is/are tested for binding (1) to a bacterial toxin, and (2) binding to a native antigen selected from at least one of (a) a gut-related antigen and (b) a blood brain barrier-related antigen. In certain aspects, the bacterial toxin can advantageously comprise a lipopolysaccharide.

When testing for intestinal permeability, the native gut-related antigen is preferably selected from the list consisting of: (1) an intestinal structural protein; (2) a tight junction protein; (3) a binding receptor to the tight junction protein; and (4) a cell junction protein. In examples of certain aspects of the present invention, testing occurs for antibodies to one or more of actin/actomyosin, occludin and/or zonulin, intestinal ZOT receptor, and matrix metalloproteinase-3 (MMP-3).

When testing for a blood brain barrier permeability, the blood brain barrier-related antigen is preferably selected from the list consisting of: (1) a blood brain barrier protein; (2) a glial fibrillary acidic protein (GFAP); (3) a matrix metalloproteinase (MMP), (4) a brain ZOT binding protein; (5) a brain ZOT receptor; (6) a calprotectin; and (7) a myelin basic protein. In examples of certain aspects of the present invention, testing occurs for antibodies to one or more of (1) a blood brain barrier protein; (2) a glial fibrillary acidic protein (GFAP); and (3) a matrix metalloproteinase (MMP).

From a diagnostic perspective, analysis of test results from one or more of the foregoing described methods can be used to assist in the detection and/or diagnosis of a disease associated with leaky gut syndrome and/or excessive blood brain barrier permeability.

In certain aspects of the present invention, the detection of the samples binding to the respective components can be performed with an immunoassay, including, but not limited to ELISA assay, RIA assay, latex agglutination, beads assay, proteomic assay, and other immunoassays known to one of ordinary skill in the art.

In certain aspects of the present invention, test plates and kits for conducting the immunoassay can also be provided, including for example an improved test plate having as bound peptides: (1) a bacterial toxin; and (2) a native antigen comprising at least one of (a) a gut-related antigen and (b) a blood native brain barrier-related antigen.

In particularly preferred test plates used to assist in the detection and diagnose or otherwise identify a disease associated with leaky gut syndrome, the gut-related antigen can advantageously be selected from the list consisting of: (1) an intestinal structural protein; (2) a tight junction protein; (3) a binding receptor to the tight junction protein; and (4) a cell junction protein.

In particularly preferred test plates used to diagnose or otherwise identify a disease associated with excessive blood brain barrier permeability, the blood brain barrier-related antigen can advantageously be selected from the list consisting of: (1) a blood brain barrier protein; (2) a glial fibrillary acidic protein (GFAP); (3) a matrix metalloproteinase (MMP), (4) a brain ZOT binding protein; (5) a brain ZOT receptor; (6) a calprotectin; and (7) a myelin basic protein.

It is contemplated that test kits can include one or more plates that collectively test for both a first set of antigens associated with leaky gut syndrome and a second set of antigens associated with excessive blood brain barrier permeability.

From a more general perspective, methods and apparatus are contemplated herein for assisting in the detection and diagnosis of a disease associated with excessive permeability of an anatomical barrier, comprising: obtaining and analyzing test results from an antibody test panel that produces signals from binding of a sample from the patient to a bacterial toxin, and a native antigen selected from at least one of (a) a gut-related antigen and (b) a blood native brain barrier related antigen.

In all of these contemplated methods and apparatus, the samples can comprise any suitable bodily sample, including for example a whole blood sample, a blood serum/sera sample, a saliva sample, or a sample from other bodily fluids.

It is still further contemplated that methods and apparatus contemplated herein can be used to assist in differentially diagnosing diseases related to (1) a gut flora dysbiosis, and (2) a breakdown in intestinal barrier. For example, as currently contemplated, a diagnosis related to gut flora dysbiosis would tend to be indicated when the test results include a positive result for any of IgA, IgM, and IgG to the bacterial toxin of lipopolysaccharide, and negative results for all of IgA, IgM, and IgG to occludin and zonulin, and a negative result for IgG to actomysin.

Differential diagnosis is also contemplated to be aided by distinguishing between a breakdown in intestinal barrier due to a paracellular pathway and a transcellular pathway.

Regarding breakdown through paracellular pathways, a diagnosis related to breakdown in intestinal barrier by bacterial antigens would tend to be indicated when the test results include a positive result for any of IgA, IgM, and IgG to the bacterial toxin of lipopolysaccharide, and positive results for any of IgA, IgM, and IgG to occludin or zonulin, and a negative result for IgG to actomysin. In contrast, a diagnosis related to breakdown in intestinal barrier other than by bacterial antigens would tend to be indicated when the test results include a negative result for all of IgA, IgM, and IgG to the bacterial toxin of lipopolysaccharide, and positive results for any of IgA, IgM, and IgG to occludin or zonulin, and a negative result for IgG to actomysin.

Regarding breakdown through transcellular pathways, a diagnosis related to breakdown in intestinal barrier by bacterial antigens would tend to be indicated when the test results include a positive result for any of IgA, IgM, and IgG to the bacterial toxin of lipopolysaccharide, and negative results for all of IgA, IgM, and IgG to occludin and zonulin, and a positive result for IgG to actomysin.

Also according to the discoveries discussed herein, a diagnosis related to both breakdown in intestinal and blood brain barrier integrity induced by the bacterial toxin would tend to be indicated where the test results include a positive result for any of IgA, IgM, and IgG to the bacterial toxin of lipopolysaccharide, and positive results for any of IgA, IgM, and IgG to occludin and zonulin, a positive result for any of IgA, IgM, and IgG to blood brain barrier proteins, and a positive result for any of IgA, IgM, and IgG to neuronal antigens.

In contrast, a diagnosis related to both breakdown in intestinal and blood brain barrier integrity induced by factors other than the bacterial toxin are likely where the test results include a negative result for each of IgA, IgM, and IgG to the bacterial toxin of lipopolysaccharide, and positive results for any of IgA, IgM, and IgG to occludin and zonulin, a positive result for any of IgA, IgM, and IgG to blood brain barrier proteins, and a positive result for any of IgA, IgM, and IgG to neuronal antigens.

Still further it is contemplated that gut flora dysbiosis can occur without breakdown in intestinal barrier integrity, but with breakdown in the blood brain barrier integrity. For example, a diagnosis related to gut flora dysbiosis in that situation could tend to be indicated where the test results include a positive result for any of IgA, IgM, and IgG to the bacterial toxin of lipopolysaccharide, and negative results for each of IgA, IgM, and IgG to occludin and zonulin, a positive result for any of IgA, IgM, and IgG to blood brain barrier proteins, and a positive result for any of IgA, IgM, and IgG to neuronal antigens.

Similarly, a diagnosis related to breakdown m blood brain barrier integrity, neuroinflammation and neuroautoimmunity, without association with intestinal barrier or gut flora dysbiosis are likely where the test results include a negative result for each of IgA, IgM, and IgG to the bacterial toxin of lipopolysaccharide, and negative results for each of IgA, IgM, and IgG to occludin and zonulin, a positive result for any of IgA, IgM, and IgG to blood brain barrier proteins, and a positive result for any of IgA, IgM, and IgG to neuronal antigens.

Regarding specific diseases, analysis of test results contemplated herein can be used to assist in detecting and diagnosing amyotrophic lateral sclerosis, Parkinson's disease, multiple sclerosis, Alzheimer's, or peripheral neuropathy, and major depression. Such conditions are thought to be likely where the test results include a positive result for any of IgA, IgM, and IgG to blood brain barrier proteins, and a positive result for any of IgA, IgM, and IgG to neuronal antigens.

Various objects, features, aspects and advantages of the inventive subject matter of the present invention will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a prior art diagram showing a currently understood role of LPS in the induction of leaky gut and leaky brain syndrome.

FIG. 2 is a prior art diagram showing a currently understood role of LPS induction of inflammation and activation of Th17 lymphocytes in the pathogenesis of inflammatory and neuroimmunological disorders: LPS' induction of inflammatory response, production of cytokines, and increase in the number of Th17 positive cells in circulation.

FIG. 3 is a prior art diagram showing a currently understood etiology of gut to brain dysfunction—how loss of mucosal tolerance, if unmanaged, can trigger a cascade that induces intestinal barrier dysfunction, systemic inflammation, neuroinflammation, neuroinvasion, and neurodegeneration.

FIG. 4 is a diagram showing a proposed scenario of the present invention in which triggers and mechanisms involved in abnormal intestinal permeability and blood brain permeability can be used for a next generation of testing for intestinal permeability identification (IPI) and/or blood brain permeability identification (BBPI).

FIG. 5 is a diagram showing a proposed role of abnormal intestinal permeability in the pathogenesis of autoimmune disease according to certain aspects of the present invention.

FIG. 6 is a diagram showing the layout of a sample microtiter plate for conducting an immunoassay, the microtiter plate having 12 different rows with 12 different antigens and peptides according to certain aspects of the present invention.

FIG. 7 is a diagram showing the layout of a sample microtiter plate according to certain aspects of the present invention, in which IgG/IgM/IgA is measured against 12 different antigens or peptides from intestinal and BBB protein and associated tissue antigens (bound antigens and peptides are transparent).

FIG. 8 is a diagram showing the layout of a sample microtiter plate according to certain aspects of the present invention, in which IgG/IgM/IgA is measured with weekly negative and positive controls for quality control purposes (bound antigens and peptides are transparent).

FIG. 9 is a diagram showing a comparison of IgG, IgM and IgA against bacterial lipopolysaccharide and occludin/zonulin in healthy donors and patients with gastric autoimmunity. The percent elevation of IgG, IgM, IgA and IgG+IgM+IgG against bacterial lipopolysaccharide in healthy donors shown in the light bars in the graph on the left and patients with gastric autoimmunity at two standard-deviations above the mean shown in the dark bars in the graph on the left. The percent elevation of IgG, IgM, IgA and IgG+IgM+IgG against occludin/zonulin in healthy donors shown in the light bars in the graph on the right and patients with gastric autoimmunity at two standard-deviations above the mean shown in the dark bars in the graph on the right.

FIG. 10 shows IgG, IgM and IgA antibody levels tested against 12 different antigens representing the environmental factor (LPS), intestinal and BBB proteins and associated antigens in a first set of three healthy subjects (Samples 1-3), according to certain aspects of the present invention.

FIG. 11 shows IgG, IgM and IgA antibody levels tested against 12 different antigens representing the environmental factor (LPS), intestinal and BBB proteins and associated antigens in a second set of three healthy subjects (Samples 4-6), according to certain aspects of the present invention.

FIG. 12 shows IgG, IgM and IgA antibody levels tested against 12 different antigens representing the environmental factor (LPS), intestinal and BBB proteins and associated antigens in a third set of three healthy subjects (Samples 7-9), according to certain aspects of the present invention.

FIG. 13 shows IgG, IgM and IgA antibody levels tested against 12 different antigens representing the environmental factor (LPS), intestinal and BBB proteins and associated antigens in three patients (Samples 10-12) with celiac disease and gut permeability, according to certain aspects of the present invention.

FIG. 14 shows IgG, IgM and IgA antibody levels tested against 12 different antigens representing the environmental factor (LPS), intestinal and BBB proteins and associated antigens in three patients (Samples 13-15) with gluten ataxia, according to certain aspects of the present invention.

FIG. 15 shows IgG, IgM and IgA antibody levels tested against 12 different antigens representing the environmental factor (LPS), intestinal and BBB proteins and associated antigens in three patients (Samples 16-18) with multiple sclerosis (MS), according to certain aspects of the present invention.

FIG. 16 shows a clinical interpretation of certain antibodies against LPS, occludin/zonulin and actomyosin network in blood, according to certain aspects of the present invention.

FIG. 17 shows a clinical interpretation of elevated levels of certain antibodies against LPS, occludin/zonulin and actomyosin in oral fluid, according to certain aspects of the present invention.

FIG. 18 shows a clinical interpretation of elevated levels of certain antibodies against LPS, occludin/zonulin, blood brain barrier protein and neuronal antigens in blood, according to certain aspects of the present invention.

DETAILED DESCRIPTION OF THE DRAWINGS

An increased uptake of antigens is a prerequisite for disease development. A number of conditions are known to increase the permeability of the intestine and hence increase antigen uptake. It is likely that the uptake of immunogenic molecules or antigens from the lumen can result in immunological-mediated activity, both within the intestine in the form of IgA and IgM, and beyond the intestine with the production of antigen-specific IgA, IgM, IgG and immune complexes (26, 27).

I. The Effect of Bacterial Toxins and Inflammatory Cytokines on the Induction of Blood-Brain Barrier Disruption and Neuroinflammation

The blood-brain barrier (BBB) maintains the internal environment and stability of the central nervous system. Structural and functional changes to the BBB may result in autoimmune diseases, in particular, neuroautoimmune diseases such as multiple sclerosis (28).

The BBB separates blood leukocytes, which normally respond to necrotic injury, from the brain parenchyma where necrotic cell death might take place in response to environmental factors such as infections, toxins, excitotoxicity, or trauma (23). The BBB is composed of two layers. The first layer consists of microvascular endothelial cells, which have abundant tight junctions with structural similarity to that of intestinal epithelial cells (24, 28). The second layer is the glia limitans, which is formed by glial foot processes (29). The perivascular space between the endothelial cells and astrocytes is populated by macrophages, which behave like immature dendritic cells (29). Therefore, factors capable of opening the epithelial TJ barrier are able to destroy both the BBB and neuronal tissue (30-33). This includes bacterial endotoxins, proinflammatory cytokines, enzyme and effector cells Th1, Th17, which are essential to central nervous system inflammation (29, 34-35).

It is firmly established that disruption of the BBB by endotoxins, cytokines, chemokines, adhesion molecules, and others, and the trafficking of autoreactive T-cells from the systemic compartment into the central nervous system, play an important role in the development of MS lesions (36-38). However, when a comparison was made between human Th1 versus Th17 lymphocytes, human Th17 lymphocyte migrated faster across the BBB than Th1 lymphocytes. Indeed a significant number of IL-17- and IL-22-expressing CD4+CD45RO+ memory lymphocytes upon their migration across BBB expressed IL-17+ and IL-22+ markers, which confirmed the ability of Th17 lymphocytes to cross the BBB in vitro and in vivo (35). The BBB endothelial cells expressed IL-17R and IL-22R, which are used by Th17 lymphocytes to infiltrate the BBB endothelial cells (ECS). This diffusion of cells or antigens, such as bovine serum albumin (BSA), a macromolecule, across the BBB was enhanced significantly when IL-17 and IL-22 were added to monolayers of human BBB-ECS. This enhanced permeability of BBB-ECS correlated with a decrease in the expression of occludin and zonulin, the two important tight junction proteins (39).

These results strongly suggest that inflammation induced by LPS and other bacterial toxins causing activation of Th17 lymphocyte expression of IL-17 and IL-22 receptors on blood-brain barrier endothelial cells results in binding of Th17 to BBB tight junctions. This disrupts the tight junctions, leading to transmigration of Th17 and autoreactive T cells across the BBB, release of granzyme-B by the Th17, and interferon-gamma by CD4 cells, resulting in neuronal cell destruction, release of neuronal cell antigens and BBB proteins into the circulation (the cells co-expressing IL-17, IL-22 and granzyme B through the action of IL-17 and IL-22) play a significant role in the induction and breach in the BBB and the permeabilization of BBB to circulating CD4+ lymphocytes and soluble molecules resulting in CNS inflammation (40-44). The role of Th17 lymphocytes in the pathogenesis of inflammatory and neuroimmunological disorders is shown in FIG. 2. Based on this mechanism of action, bacterial toxin induction of gut permeability and disruption of BBB protein structure can result in antibody production not only against LPS but also against tight junction proteins and BBB proteins. Therefore, steps for tackling neuroinflammation according to certain aspects of the present invention begin with testing for LPS, occludin, claudins, BBB proteins, tight junction protein, enzymes such as matrix metalloproteinase and associated receptor antibodies, based on which clinicians can plan the repair of the gastrointestinal barrier dysfunction, followed by dampening systemic inflammation and ending with the restoration of the blood-brain barrier.

Expression of IL-17 and IL-22 receptors on blood-brain barrier endothelial cells result in the binding of Th17 cells to BBB tight junctions. This disrupts the tight junctions, leading to autoreactive CD4 cells and neurodegeneration. Th17 cells then transmigrate across the BBB, setting the stage for the killing of neurons by the release of granzyme B. This release of neural cell antigens results in a vicious cycle of neuroautoimmunity and neurodegeneration.

Based on information presented here, it is hypothesized that the gut is the starting point for many neurodegenerative disorders. It begins with imbalanced microflora, which releases copious amounts of lipopolysaccharide (LPS). The abundant LPS endotoxins induces up-regulation of proinflammatory cytokines TNF-alpha and IL-1 beta, resulting in degradation or dissociation of TJs and their proteins, including occludin and zonulin. This is followed by inflammation in the blood stream which travels to the BBB. The inflammation opens the BBB, causing neuro-infiltration, neuroinflammation, neuroautoimmunity and finally, neurodegeneration. FIG. 3 represents the pathophysiology leading to neurodegeneration; if a person's intestinal barrier dysfunction is not addressed, the person could develop neuroinflammation and possible neurodegeneration over time. Many autoimmune disorders have multiple triggers, symptoms, and system dysfunctions. In cases of neuroautoimmunity, where many of the individuals produce high levels of antibodies to the LPS, TJs, and to the BBB protein, the immune and nervous systems are involved. The common ground for these two systems is the GI tract, the importance of which has been addressed (43).

Therefore, in certain aspects of the present invention, the detection and measurement of antibodies against TJ proteins such as occludin, bacterial endotoxins such as LPS, and BBB proteins is the best way not only to assess GI and intestinal barrier integrity, but also determine and/or diagnose the root cause of systemic inflammation, neuroinflammation, neuroinvasion and neurodegeneration. Also, any lesions of the intestinal epithelium must be quickly repaired.

Otherwise, this would allow the penetration of dietary proteins, commensal and pathogenic bacteria into the circulation, driving an inflammatory cascade that would result in complex autoimmune and neuroimmune disorders.

II. Measurement of Permeability to Small Sugars Versus Large Antigenic Molecules

The current methodology for assessing intestinal permeability uses lactulose and mannitol. Over the last 40 years, it has been a useful clinical tool. Lactulose absorption suggests a tear in the gut barrier, and thus, intestinal permeability. Against popular belief, the absorption of this small molecule actually indicates a minute leak rather than a tear. Lactulose has relatively low molecular size, and the transfer of this substance through the gut membranes does not reflect the situation for transfer of food or other proteins, and immune response against them. Furthermore, Lactulose/Mannitol test measures the transfer of small molecules only through paracellular but not transcellular pathway.

Therefore, Large Molecule Intestinal Permeability Identification (LMIPI) should be assessed using large molecules such as bacterial endotoxins (comparable to the size of food proteins), which are antigenic and challenge the immune system. Furthermore, in regard to BBB permeability, although several lines of evidence have revealed that alterations in BBB permeability are a primary initiating factor in MS and experimental autoimmune encephalomyelitis (EAE) (45-50), there is currently no recognized blood test for the measurement of BBB permeability. However, in animal models morphological and functional changes in the BBB have been demonstrated by using zonulin/occludin to measure barrier damage impairment (7, 11, 28).

As shown in FIG. 4, the emphasis of the methodology of the present invention is on large molecules that are antigenic and which, upon their release from the barriers, have the capacity to challenge the immune system, resulting in the production of specific IgG, IgM and/or IgA antibodies against them, which are detected in blood, blood serum, and/or saliva samples.

Assessment of intestinal barrier permeability to large antigenic molecules such as bacterial endotoxins and dietary proteins is becoming important in the understanding of the pathogenesis of gastrointestinal and autoimmune diseases. Scientific evidence indicates that many gastrointestinal and autoimmune disorders are accompanied by an increased translocation of endotoxins and other bacterial toxins from aerobic and anaerobic bacteria through the gut wall (7, 51-55). This increased translocation and the inflammation associated with it may induce degradation of tight junction proteins and a subsequent immune response against tight junction proteins such as occludin/zonulin and bacterial endotoxins such as LPS. Indeed, rat and human epithelial cells exposed to bacterial toxins or gliadin secrete a significant amount of zonulin. This release of zonulin is followed by disengagement of the protein ZO-1 from the tight junctional complex, resulting in intestinal permeability through the paracellular pathway (7, 51). And, many chronic conditions are accompanied by increased serum levels of IgA and IgM against LPS and other antigens of pathogenic bacteria (24, 25). These conditions cause gut inflammation and mucosal barrier permeability, whereby enlarged spaces between the cells of the gut wall and dissociation of tight junction proteins can induce losses in the actomyosin network and the protective barrier. This loss of protective barrier may increase bacterial translocation and thus enhance the concentration of serum endotoxins, tight junction proteins, and actomyosin.

According to certain aspects of the present invention, the increased serum IgA and IgM against LPS, tight junction protein (occludin/zonulin) and actomyosin indicate the presence of intestinal barrier permeability and the trafficking of macromolecules across the barriers. The endotoxins of bacteria may be causing the autoimmunity through bacterial toxin acting as a superantigen to T lymphocytes, or by a mechanism called molecular mimicry. Many bacteria have antigenic sites very similar to human tissue antigens, including neuronal tissue. If intestinal barrier permeability is left unchecked, then the inflammatory cascade of antigens and the antibodies produced against them will go in turn into various tissues and trigger first inflammation and then autoimmunity, including neuroautoimmunity. Therefore, if antigenic intestinal barrier permeability is allowed to run its course, the continued degeneration can trigger systemic inflammation, followed by the induction of antigenic and cellular blood brain barrier permeability, bringing concomitant additional immune reactions that result in neuroinflammation, neuroinvasion and eurodegeneration.

Thus, according to certain aspects of the present invention, patients with chronic inflammatory and autoimmune conditions should be checked for the existence of increased gut permeability to large antigenic molecules by measurement of IgA, IgG and/or IgM against bacterial LPS, tight junction proteins and actomyosin. Finally, in addition to measurement of IgA, IgG and/or IgM antibodies against LPS and occludin/zonulin, these antibodies should also be measured against BBB proteins, enzymes, associated receptors, and neuronal antigens in patients with neuroimmune disorders. This multi-step process of TJ degradation by bacterial toxins and the production of antibodies against released TJ proteins, LPS and other bacterial antigens, which leads to tissue damage and autoimmunity, is illustrated in FIG. 5.

According to certain aspects of the present invention, the detection and measurement of IgA and IgM in oral fluid and IgG, IgM and IgA in blood against TJ proteins and LPS would be the best assay for assessment of intestinal barrier function, while the detection and measurement of LPS, occludin/zonulin and other tight junction proteins, plus BBB proteins and neural cell antibodies (IgG, IgM and IgA) in blood would be the best method for assessment of intestinal/BBB permeability and neuroautoimmunity.

Bacterial antigens (LPS) induce degradation of tight junctions and zonulin release, causing the opening of the tight junctions and the passage of occludin and LPS through the tight junctions and subsequent migration into the submucosa, where the occludin and LPS are presented to macrophages and dendritic cells. Macrophages present these antigens to T and B cells; this is followed by aberrant immune response, both humoral (IgA, IgM and IgG antibodies against occludin and LPS) and cell-mediated. This interplay between humoral and cell-mediated immunity is ultimately responsible for the autoimmune process targeting the intestinal epithelium and other tissue antigens, leading to the tissue damage typical of autoimmune diseases.

Following are exemplary descriptions of assays, and their use and analysis with respect to some test patients. Although other materials and methods similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred method and materials now described in the exemplary description of assays to further illustrate the present invention according to certain aspects.

ELISA Assay A. Materials and Methods—Plate and Sample Preparation:

Lipopolysaccharides from E. coli 055:85; E. coli K-235, Pseudomonas aeruginosa, Pseudomonas putida, Salmonella enteritidis, Salmonella typhimurium, Klebsiella pneumonia, Morganella morganii, Hafnia alvei, Citrobacter koseri, actin, actomyosin, myelin basic protein and a-B crystallin were purchased from Sigma-Aldrich, ST. Louis, Mo. Glial fibrillary acidic protein (GFAP) was purchased from Boehringer Mannheim, Indianapolis, Ind. Also used were zonulin peptides I, 2, 3, intestinal ZOT receptor, myelin basic protein peptide 87-106, cell junction protein, matrix metalloproteinmase-3, calcium-binding region of S100-B named in this study, BBB-I MSELEKAMVA LIDVFHQYSG REGDKHKLKK, BBB-2 SELKELINNE LSHFLEEIKE QEVVDKVMET, BBB-3 LDNDGDGECD FQEFMAFVAM VTTACHEFFE HE, brain ZOT binding protein-I, -2, calprotectin (MRP-8), and brain ZOT receptor.

All peptides HPLC grade with purity of greater than 90% were synthesized by EZ Biolab of Carmel, Ind. Throughout this application, unless the context dictates the contrary, all ranges set forth herein should be interpreted as being inclusive of their endpoints, and open-ended ranges should be interpreted to include commercially practical values. Similarly, all lists of values should be considered as inclusive of intermediate values unless the context indicates the contrary.

Antigens and peptides were dissolved in methanol at a concentration of 10.0 mg/mL, then diluted 1:100 in 0.1M carbonate-bicarbonate buffer, pH 9.5, and 50 μl were added to each well of a polystyrene flat-bottom ELISA plate, as shown in FIG. 6.

Plates were incubated overnight at 4° C. and then washed three times with 200 μl Tris buffered saline (TBS) containing 0.05% Tween 20 (pH 7.4). The non-specific binding of immunoglobulins was prevented by adding 200 mL of 2% bovine serum albumin (BSA) in TBS, and incubated overnight at 4° C. Plates were washed and after quality central (QC) were kept at 4° C. until used.

The enzyme conjugates included: Affinity Purified Antibody Phosphatase-labeled Goat anti-Human IgG (Jackson ImmunoResearch, Cat#109-055-008); Affinity Purified Antibody Phosphatase-labeled Goat anti-Human IgA (Jackson ImmunoResearch, Cat#109-055-011); and Affinity Purified Antibody Phosphatase-labeled Goat anti-Human IgM (Jackson ImmunoResearch, Cat.#109-055-043).

Other additional reagents and materials included in the method as further described herein, includes: Phosphate-Buffered Saline Powder (Sigma, Cat#P3813-10PAK), Bovine Serum Albumin (Biocell, Cat#3203-00), Sodium Azide (Sigma, Cat#S-2002), Tween 20 (Sigma, Cat#P1379-1000ML), Glycerol (Sigma, Cat#G5516-500ML), Sodium Hydroxide (Sigma, 15 Cat#S-5881), Magnesium Chloride (Sigma, Cat#8266), Diethanolamine (Sigma, Cat#D-8885), 1.0 N Hydrochloric Acid Solution (Sigma, Cat#H3162-1GA), 5 mg Substrate Tablets: p-NPP (para-nitophenyl phosphate) (Sigma, Cat#S-0942), and Distilled water (D. H20).

The microwell plates were prepared and coated with 12 different gut-brain-associated antigens or peptides, as shown in FIG. 6. Calibrator and positive controls and diluted patient samples were added to the wells and autoantibodies recognizing different antigens bind during the first incubation. After washing the wells to remove all unbound proteins, purified alkaline phosphatase labeled rabbit anti-human IgG/IgM/IgA unbound conjugate were removed by a further wash step.

Bound conjugate was visualized with paranitrophenyl phosphate (PNPP) substrate, which gives a yellow reaction product, the intensity of which is proportional to the concentration of autoantibody in the sample. Sodium hydroxide was added to each well to stop the reaction. The intensity of color was read at 405 nm.

Plain red tops or red tiger tops (SST tubes) were used for specimen collection, although in certain aspects, other specimen collection apparatus are contemplated for this assay.

Blood samples were collected using aseptic venipuncture techniques and serum was obtained using standard procedures. In certain aspects, it is preferred that a minimum of 100 microliter of serum for the assay, which therefore corresponds to about one ml or more of blood.

B. Test Assay Procedure

The analytical procedure for IgG, IgM, and/or IgA antibody against LPS, intestinal and/or BBB proteins is now discussed. In some aspects, all reagents were allowed to reach room temperature before the test assay was commenced. The test assay procedure includes preparing the desired number of coated wells or plates with the desired number and type of antigens and/or peptides. Once the microtiter wells are prepared, about 100 μl of 1:100 diluted control calibrator are added to Rows A and B of the microtiter plate as shown in FIG. 7, which can be done using a multi-channel pipettor. About 100 μl of 1:100 diluted patient's test sample, here blood serum, was added to duplicate wells of rows C and D for the first Clinical Specimen rows E and F for the second Clinical Specimen and rows G and H for the third Clinical Specimen as shown in FIG. 7.

On a separate plate, the periodic (i.e., weekly) negative and positive controls similar to clinical specimens in duplicates were conducted, as shown in FIG. 8.

The plates were then incubated for about 60 minutes at room temperature. After incubation, the wells were then emptied and washed four times with PBS using an ELISA Washer. About 100 μl of optimally diluted alkaline phosphatase-labeled goat anti-human IgA was added to the IgA plate or about 100 μl of enzyme-labeled IgG was added to the IgG plate and anti-IgM was added to the IgM plate at optimal dilution.

The respective plates were then incubated for about 30 to about 60 minutes at room temperature. About ten minutes before the conjugate-incubation ends, a substrate solution was prepared by mixing about 5 mg of p-nitrophenyl phosphate tablet with about 5 ml of substrate buffer, which was mixed well until the tablet completely dissolved. Washing four times with PBS using the ELISA washer was repeated. Then, about 100 μl of substrate solution was added to each well. The plate was then incubated for about 30 minutes at room temperature with the avoidance of any exposure to direct sunlight. The reaction was stopped by adding about 50 μl of 3 N NaOH. The color intensity of the wells were read using a microtiter plate reader at 405 nm against a blank well, with the absorbance values of calibrators, controls and unknown samples being recorded.

C. Calculation of Results

After the plate was read at 405 nm to obtain the optical density values (OD405), the mean ODs of the negative controls, the mean ODs of the positive controls and the mean ODs of each clinical specimen were divided by the mean ODs of calibrators on Rows A and B to obtain each Index Value (IV).

The Index Value (IV) for each antibody was calculated against the 12 different antigens by dividing the mean OD of each duplicate sample by the mean OD of the calibrator control value (for example, divide the mean OD of wells Cl and DI by the mean OD of wells A1 and B1, the mean OD of wells C2 and D2 by the mean OD of wells A2 and B2, the mean OD of wells C3 and D3 by the mean OD of wells A3 and B3, etc.).

The results were then compared to the established reference ranges.

${Index} = \frac{{Mean}\mspace{14mu} {OD}\mspace{14mu} {of}\mspace{14mu} {patients}}{{Mean}\mspace{14mu} {OD}\mspace{14mu} {of}\mspace{14mu} {calibrators}}$

Index calculation for Zonulin/Occludin Cal 1 (OD) 0.48 Cal 2 (OD) 0.50 Sample 3 A (OD) 3.4 Sample 3 B (OD) 3.2 Index 6.7

D. Interpretation of Results

i. Pattern of IgG/IgM/IgA Antibody in Patients with Celiac Disease, Gluten Immune Reactivity and Sensitivity, and Crohn's Disease:

Examples of IgG, IgM, and IgA antibody patterns of 9 healthy subjects (FIGS. 10-12) and their comparison with 3 patients with celiac disease and intestinal permeability (FIG. 13), 3 patients with gluten ataxia (FIG. 14), and 3 patients with multiple sclerosis (FIG. 15) are shown in FIGS. 10-15, respectively.

Data interpretation and laboratory differentiation between celiac disease and gluten immune reactivity/sensitivity/autoimmunity are shown in FIGS. 16-18.

ii. Pattern of IgG, IgM and IgA Antibody against Intestinal, BBB Proteins and Associated Antigens in Patients with Celiac Disease and Gut Permeability, Gluten Ataxia, and Patients with MS.

Based on the calculation of indices, the pattern of IgG, IgM and IgA antibodies in the nine healthy control subjects (FIGS. 10-12), 3 patients with celiac disease and gut permeability (FIG. 13), 3 patients with gluten ataxia (FIG. 14), and 3 patients with multiple sclerosis (FIG. 15) is shown in FIG. 10-15, respectively. Note that in all healthy subjects, other than LPS and MBP, the antibody indices of which may be higher than 1.5 but not significantly greater than 2.0, the antibody indices against other antigens are lower or much lower than 1.5 (FIGS. 10-12).

In patients with celiac disease as confirmed by IgG and IgA against deamidated a-gliadin 33-mer peptide, tissue transglutaminase (tTg), and gliadin-tTg complex, the pattern of antibody varies from patient to patient.

For example, Sample 10 in FIG. 13, these antibodies are significantly elevated against LPS, zonulin/occludin, intestinal ZOT receptor, cell junction protein, MMP-3, α-B crystallin, and myelin basic protein, indicating that in addition to enhanced gut permeability the patient may be suffering from BBB permeability. Sample 11 in FIG. 13 shows significant elevation of antibodies against cell junction protein and intestinal ZOT receptor, and moderate elevation against LPS, but not against BBB proteins and neural antigens, indicating that in addition to celiac disease the patient may be suffering from intestinal permeability, BBB permeability, neuroautoimmunity, and possibly other autoimmunities.

The level of IgG, IgM and IgA antibodies against 12 different antigens representing gut-to-brain in 3 patients (Samples 13-15) with gluten ataxia is shown in FIG. 14. Gluten ataxia in these patients was confirmed by the presence of IgG and IgA antibodies against deamidated α-gliadin 33-mer peptide, tTg-2, gliadin-tTg complex, tTg-6 and cerebellar antigens. In these patients the pattern of antibodies was significantly higher against ZOT-binding protein, brain ZOT receptor, α-B crystallin, calprotectin, GFAP, and cell junction protein, confirming barrier damage impairment.

The level of these antibodies against 12 tested antigens in 3 patients (Samples 16-18) with MS is summarized in FIG. 15. In addition to an abnormal MRI, a diagnosis of MS was made based on antibody detection against MBP, myelin oligodendrocyte glycoprotein (MOG), aB crystallin, proteolipid protein, lymphocyte activation and proinflammatory cytokine production (44). Significant elevation in the level of antibodies was detected against neuronal antigens, BBB proteins and zonulin/occludin. This is indicative that indeed patients with MS suffer from BBB dysfunction.

Iii. Measurement of IgG, IgM and IgA Antibodies Against Bacterial Lipopolysaccharide and Occludin/Zonulin in Patients with Gastric Autoimmunity.

Intestinal permeability is significant in gastrointestinal autoimmune disease (4). FIG. 9 shows diagrams that compare the elevation of antibodies against bacterial endotoxins (lipopolysaccharides) and the structure of the tight junctions (occludin/zonulin) in healthy controls and patients with gastric autoimmunity.

The exaggerated entrance of antigenic macromolecules across the gut epithelium can initiate production of, and perpetuate an ongoing increase in, multiple inflammatory cytokines and systemic chronic inflammation (56). This appears to be a required component for the trio of factors that lead to eventual autoimmune disease (genetic vulnerability, environmental exposure, and intestinal permeability).

According to certain aspects of the present invention, it is hypothesized herein that elevated antibodies to LPS, occludin/zonulin and the actomyosin network are biomarkers identifying the breakdown of a healthy intestinal barrier, and that elevated antibodies to LPS, occludin/zonulin, other cell junction proteins, BBB proteins plus neural antigens (for example, MBP, a-B crystalline, GFAP, calprotectin, and brain ZOT protein) not only indicate the breakdown of a healthy intestinal barrier, but also a failure in BBB integrity.

Clinical interpretation of elevated level of antibodies against LPS, occludin/zonulin and actomyosin in oral fluid according to certain aspects of the present invention is shown in FIG. 17.

Clinical interpretation of elevated blood level of antibodies against LPS, occludin/zonulin, blood brain barrier protein and neural antigens according to certain aspects of the present invention is shown in FIG. 18.

Case Study Examples

Two different case reports, the first on a patient with celiac disease and the second with multiple sclerosis are provided as follows.

A. Case Report #1: Patient With Celiac Disease And Intestinal Barrier Dysfunction

A 38 year-old woman 5′4″ in height weighing 106 lbs with GI disorder including constipation, diarrhea and pain all over the body, with fibromyalgia-like syndrome and loss of weight (1-2 lbs per month during the last six months) was examined by an internist. Lab investigation revealed abnormal CBC with hemoglobin of 9.9 g/dl, MCV of 77 fL, erythrocyte sedimentation rate of 54 mm/1st hr, with low concentration of folate and vitamin B-12 but high level of liver enzymes and high sensitive C-reactive protein. Detailed biochemical and immunological profiles including ANA, rheumatoid factor, T3, T4 and TSH levels were performed and all tests were within the normal range. After repeated complaints about GI discomfort, low-grade fever and headache, the patient was referred for GI evaluation. Colonoscopy and duodenal biopsy were performed and immunohistological evaluation revealed total villous atrophy with Marsh III classification. At this point IgG and IgA concentrations against gliadin and transglutaminase were checked. Both IgG and IgA against gliadin and transglutaminase were 3-5 fold higher than the reference range.

In view of the villous atrophy, gliadin and transglutaminase positivity diagnosis of celiac disease was made. The patient was transfused with blood, put on anti-inflammatory medication and started on a gluten-free diet. Three months later, although her overall GI discomfort had improved and she had gained 4 pounds, her CRP was still elevated, and the body ache and low-grade fever continued. In view of this and to determine the root cause of the inflammation and low-grade fever, antibodies against LPS, zonulin/occludin, and cell junction proteins were examined. Results presented in FIG. 13, Sample 10 showed that in comparison to healthy subjects, the patient (Sample 10) had a 3-6 fold increase in IgG, IgM and IgA antibody levels 5 against LPS, zonulin/occludin and cell junction proteins, indicating that in addition to celiac disease the patient was suffering from bacterial translocation, tight junction damage and leaky gut syndrome to large antigenic molecules.

Accordingly, in addition to the gluten-free diet, the patient was treated for leaky gut syndrome with the implementation of a lectin-free diet plus probiotics glutamine, N-acetylcysteine, EP A/DHA, vitamin D, lactoferrin, xylitol, and boswellic acid. Thirty days after commencement of this probiotic regimen plus the lectin- and gluten-free diet, the patient's clinical condition had improved significantly: her fever was down to 3 7° C. and she had gained an additional 6 lbs. Sixty days later the treatment for leaky gut was reduced to probiotics only, but the gluten-free diet was continued. One year later all lab tests were repeated, and the repeat tests for gliadin, transglutaminase, CRO, LPS, and zonulin/occludin were within the normal range, which was a further indication that management for leaky gut plus a gluten-free diet was effective in the treatment of this patient who suffered from celiac disease and leaky gut syndrome.

Discussion: It has been established in the literature that in addition to villous atrophy the majority of patients with celiac disease also suffer from leaky gut syndrome. For this reason, approximately only 50% of patients with celiac disease improve on a gluten-free diet, with the structure of their villi returning to normal after six months of such treatment. The mechanism by which leaky gut syndrome is induced in celiac disease is due to the fact that in some individuals specific gliadin peptides bind to the epithelial cell and cause damage to the tight junction proteins, causing the release of zonulin/occludin and claudins from the submucosa into the blood. In this particular case, some of the patient's symptomatologies improved on the gluten-free diet, but the gluten-free diet did not ameliorate the inflammatory cascade induced by the LPS translocation and enhanced gut permeability. However, 30-90 days after implementation of the gluten-free diet plus treatment for repairing the tight junction proteins using natural remedies (57-61), both clinical symptomatologies and lab test results were back to normal. Thus, it is concluded that patients with celiac disease should be screened for leaky gut for large molecules that are antigenic, and treated not only for celiac disease but also for repairing the gut barrier.

The inventive subject matter of the present invention provides for this capability.

B. Case Report #2: Patient with Multiple Sclerosis, Gut and Blood-Brain Barrier Permeability

A 38 year-old man 5′8″ in height weighing 182 lbs following a 3-week history of progressive neck, back and muscle pain with weakness of the limbs was referred to a neurologist. On the day prior to referral, he developed difficulty in passing urine with tingling and sensory disturbance in his trunk and legs to a degree where he was unable to climb stairs. Just over two years prior to admission, the patient had family problems and had become very depressed, for which he had not sought any help. His overall past history was otherwise unremarkable except for unexplained mild microcytic anemia which had been treated with vitamin B-12 and iron supplements.

To clarify whether or not the patient may have suffered from a minor stroke or was suffering from some neurological or autoimmune disorder, a series of immunological profiles and neurological examinations was initiated.

Lab investigation revealed normal chemistry and CBC with a hemoglobin result of 10.8 g/dl. The immunological profile including ANA, rheumatoid factor, immune complexes, total immunoglobulins, cardiolipid antibodies and thyroid function tests were within the normal range.

During further investigation cerebrospinal fluid and blood was collected and examined for mycobacteria, Borrelia, CMV, EBV, Herpes Type-6, HTLV-1 and -2, and syphilis, all of which were negative. CSF protein was 0.7 g/L, and glucose 2.3 mMol/L.

Neurological examination revealed reduced corrected visual acuity of 6/48 in the right eye and 6/36 in the left eye with normal eye movements. The patient had pyramidal weakness in both legs with mildly-based gait. Pinprick examination demonstrated hemisensory level below D 10 on both sides.

An MRI scan of the brain showed mild white matter abnormalities with mild generalized atrophy, which has been observed in patients with MS.

However, to exclude the possibility of gluten sensitivity, celiac disease and leaky gut syndrome, AGA, tTg antibody, and lactulose/mannitol tests were performed. A celiac screen revealed both IgG and IgA anti-gliadin antibodies 3-6 fold above the reference range but was completely negative for IgG and IgA against transglutaminase. In addition, the lactulose/mannitol test result was highly abnormal. Consequently, the following additional tests were performed: IgG, IgM and IgA antibody against LPS, zonulin/occludin, intestinal ZOT receptor, cell junction protein, MMP-3, brain ZOT binding protein, brain ZOT receptor, calprotectin, GFAP, a-B crystallin, BBB protein, and MBP. Results summarized in FIG. 15, Sample 17 show a significant elevation in antibody levels against MBP and GFAP, confirming the abnormal MRI findings and a diagnosis of MS. Furthermore, a significant elevation of antibodies against zonulin/occludin, calprotectin and BBB protein indicated involvement of the 5 GI tract with enhanced gut and BBB permeability in this patient (FIG. 15). Based on these test results, the patient was given 1 g intravenous methylprednisolone for five days with some resultant clinical improvement. At this point the patient was put on β-seron, showing significant improvement fifteen days later. Furthermore, 200 mg of minocycline IV glutathione, plus probiotics glutamine, N-acetylcysteine, EP A/DHA, vitamin D, lactoferrin, xylitol, and boswellic acid were given for repairing the damaged BBB and gut barriers. Three months after this regimen the patient's overall health had improved significantly.

It should be apparent to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the scope of the appended claims. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refers to at least one of something selected from the group consisting of A, B, C . . . and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.

REFERENCES

-   1. Walker W A, Sanderson I R. Epithelial barrier function to     antigens. Ann NY Acad. Sci. 664: 10-17, 1992. -   2. Walker W A, Isselbacher K J. Uptake and transfer of     macromolecules by the intestine. Gastroenterol. 67: 531-550, 1974. -   3. Arrieta M C, Bistritz L, Meddings J B. Alterations in intestinal     permeability. Gut. 55: 1512-1520, 2006. -   4. Fasano A, Shea-Donohue T. Mechanisms of disease: the role of     intestinal barrier function in the pathogenesis of gastrointestinal     autoimmune diseases. Nat Clin Prac Gastroenterol Hepatol. 2(9):     416-422, 2005. -   5. Sapone A, Lammers K M, Mazzarella G, et al. Differential mucosal     IL-17 expression in two gliadin-induced disorders: gluten     sensitivity and the autoimmune enteropathy celiac disease. Int Arch     Allergy Immunol. 152: 75-80, 2010. -   6. Sapone A, Lammers K M, Casolaro V, et al. Divergence of gut     permeability and mucosal immune gene expression in two     gluten-associated conditions: celiac disease and gluten sensitivity.     BMC Med. 9: 23, 2011. -   7. Fasano A. Zonulin and its regulation of intestinal barrier     function: the biological door to inflammation, autoimmunity and     cancer. Physiol Rev, 91: 151-17 5, 2011. -   8. Shor D B, Barzilai O, Ram M, et al. Gluten sensitivity in     multiple sclerosis: experimental myth or clinical truth? Ann NY Acad     Sci, 1173: 343-349, 2009. -   9. Vojdani A, O'Bryan T, Green J A, et al. Immune response to     dietary proteins, gliadin and cerebellar peptides in children with     autism. Nutr Neurosci. 7(3): 151-161, 2004. -   10. Correale J, Villa A. The blood-brain-barrier in multiple     sclerosis: functional roles and therapeutic targeting. Autoimmunity.     40: 148-160, 2007. -   11. Morgan L, Shah B, Rivers L E, et al. Inflammation and     dephosphorylation of the tight junction protein occludin in an     experimental model of multiple sclerosis. Neurosci. 147: 664-673,     2007. -   12. Skardelly M, Armbruster F P, Meixensberger J, et al. Expression     of zonulin, c-kit, glial fibrillary acidic protein in human gliomas.     Transl Oneal. 2: 117-120, 2009. -   13. Yacyshyn B, Meddings J, Sadowski D, et al. Multiple sclerosis     patients have peripheral blood CD45RO+B cells and increased     intestinal permeability. Dig Dis Sci. 41(12): 2493-2498, 1996. -   14. Garate I, Garcia-Bueno B, Madrigal, J L M et al. Origin and     consequences of brain toll-like receptor 4 pathway stimulation in an     experimental model of depression. J. Neuroinjlamm. 8:151, 1-31,     2011. -   15. Al-Sadi R M, Ma T Y. IL-1˜causes an increase in intestinal     epithelial tight junction permeability. J Immunol. 178: 4641-4649,     2007. -   16. Matysiak-Budnik T, Thomas-Collignon A, Megraud F, Heyman M.     Alterations of epithelial permeability by Helicobacter and IL-1 beta     in vitro: protective effect of rebamipide. Dig Dis Sci, 2001;     46:1558-1566. -   17. Turner J R. “Putting the squeeze” on the tight junction:     understanding cytoskeletal regulation. Semin Cell Dev Biol, 2000;     11:301-308. -   18. Ma T Y, Hoa N T, Tran D D, Bui V, Pedram A, Mills S,     Merryfield M. Cytochalasin B modulation of Caco-2 tight junction     barrier: role of myosin light chain kinase. Am J Physiol, 2000;     279:G875-G885. -   19. Ma T Y, Tran D, Hoa N, Nguyen D, Merryfield M, Tarnawski A.     Mechanism of extracellular calcium regulation of intestinal     epithelial tight junction permeability: role of cytoskeletal     involvement. Microsc Res Tech, 2000; 51: 156-168. -   20. Al-Sadi R, Ye D, Dokladny K, Ma T Y. Mechanism of IL-1-induced     increase in intestinal epithelial tight junction permeability. J     Immunol. 2008; 180:5653-5661. -   21. Shen L, Black E D, Witkowski E D, Lencer W I, Guerriero V,     Schneebrger E E, Turner J R. Myosin light chain phosphorylation     regulates barrier function by remodeling tight junction structure. J     Cell Sci, 2006; 119:2095-2106. -   22. Hecht G, Pestic L, Nikcevic G, Koutsouris A, Tripuraneni J,     Lorimer Dd, Nowak G, Guerriero, Jr V, Elson El, Lanerolle P D.     Expression of the catalytic domain of myosin light chain kinase     increases paracellular permeability. Am J Physiol, 1996;     271:C1678-1684. -   23. Ma T Y, Boivin M A, Ye E, Pedram A, Said H M. Mechanism of TNF-a     modulation of Caco-2 intestinal epithelial tight junction barrier:     role of myosin light-chain kinase protein expression. Am J Physiol,     2005; 288:G422-G430. -   24. Mae M, Kudera M, Leunis J C. The gut-brain barrier in major     depression: intestinal mucosal dysfunction with an increased     translocation of LPS from gram negative bacteria (leaky gut) plays a     role in the inflammatory pathophysiology of depression. Euro     Endocrinol Lett, 2008; 29:117-124. -   25. Mae M, Coucke F, Ategis J C. Normalization of the increased     translocation of endotoxin from gram negative enterobacteria (leaky     gut) is accompanied by a remission of chronic fatigue syndrome.     Neuro Endocrinol Lett, 2007; 28(6):101-116. -   26. Walker-Smith J A, Ford R P, Phillips A D. The spectrum of     gastrointestinal allergies to food. Ann Allergy, 1984; 53:629-636. -   27. Juvonen P, Jakobsson I, Lindberg T. Macromolecular absorption     and cow's milk allergy. Arch Dis Child, 1990; 65:300-303. -   28. Huang X N, FuJ, Wang W Z. The effects of Fasudil on the     permeability of the rat blood-brain barrier and blood-spinal cord     barrier following experimental autoimmune encephalomyelitis. J.     Neuroimmunol. 239: 61-67, 2011. -   29. Lassmann H, Zimprich F, Vass K, Hickey W F. Microglial cells are     a component of the perivascular glia limitans. J Neurosci Res, 1991;     28:236-243. -   30. Schneeberger E E, Lynch R D. The tight junction: a     multifunctional complex. Am J Physiol Cell Physiol, 2004;     286:C1213-C1228.

31. Chen M L, et al. Disruption of tight junctions and induction of proinflammatory cytokine responses in colonic epithelial cells by Campylobacter jejuni. Infect Immun, 2006; 74:6581-6589.

-   32. LaPierre L A. The molecular structure of the tight junction. Adv     Drug Deliv, 2000; 41:255-264. -   33. Wong V, Gumbiner B M. A synthetic peptide corresponding to the     extracellular domain of occludin perturbs the tight junction     permeability barrier. J Cell Biol, 1997; 136(2):399-409. -   34. Engelhardt B, Rasohoff R M. The ins and outs of the T-lymphocyte     trafficking to the CNS: anatomical sites and molecular mechanisms.     Trends Immunol, 2005; 26(9):485-495. -   35. Aloisi F, Ria F, Adorini L. Regulation of T-cell responses by     CNS antigenpresenting cells: different roles for microglia and     astrocytes. Immunol Today, 2000; 21(3):141-147. -   36. Ghirnikar R S, Lee Y L, Eng L F. Inflammation in traumatic brain     injury: role of cytokines and chemokines Neurochem Res, 1998;     23(3):329-340. -   37. Kebir H, Kreymborg K, Ifergan I, Dodelet-Devillers A, Cayrol R,     Bernard M, Biuliani F, Arbour N, Becher B, Prat A. Human THI 7     lymphocytes promote blood-brain barrier disruption and central     nervous system inflammation. Nat Med, 2007; 13: 1173-1176. -   38. Sospedra M, Martin R. Immunology of multiple sclerosis. Annu Rev     Immunol, 2005; 23:683-747. -   39. Biernacki K, Prat A, Blain M, Antel J P. Regulation of Th1 and     Th2 lymphocyte migration by human adult brain endothelial cells. J     Neuropathol Exp Neural, 2001; 60(12):1127-1136. -   40. Wosik K, Cayrol R, Dodelet-Devillers A, Berthelet F, Bernard M,     Moumdjian R, Bouthillier A, Reudelhuber T L, Prat A. Angiotensin II     controls occluding function and is required for blood-brain barrier     maintenance: relevance to multiple sclerosis. J Neurosci, 2007;     27(34):9032-9042. -   41. Kawanokuchi J, Shimizu K, Nitta A, Yamada K, Mizuno T, Takeuchi     H, Suzumura A. Production and function of IL-17 in microglia. J     Neuroimmunol, 2008; 194:54-61. -   42. Ganor Y, Teichberg V I, Levite M. TCR activation eliminate     glutamate rxeceptor GLUR3 from the cell surface of normal human T     cells via an autocrine/paracrine granzyme B mediated proteolytic     cleavage. J Immunol, 2007; 178:683-692. -   43. Vojdani A, Lambert J. A gut feeling for immune dysregulation and     neuroinflammation. The Autism File USA, 2009; 31: 56-64. -   44. V oj dani A, V oj dani E, Cooper E L. Antibodies to myelin basic     protein, myelin oligodendrocytes peptides, a-˜-crystallin,     lymphocyte activation and cytokine production in patients with     multiple sclerosis. J Internal Med, 2003; 254: 363-74. -   45. Kirk J, Plumb J, Mirakhur M, et al. Tight junctional abnormality     in multiple sclerosis white matter affects all calibers of vessel     and is associated with blood-brain barrier leakage and active     demyelination. J Pathol. 2003; 201: 319-327. -   46. Hawkins B T, Davis T P. The blood-brain barrier/neurovascular     unit in health and disease. Pharmacol Rev, 2005; 57: 173-185. -   47. Leech S, Kirk J, Plumb J, et al. Persistent endothelial     abnormalities and blood-brain barrier leak in primary and secondary     progressive multiple sclerosis. Neuropathol Appl Neurobiol, 2007;     33: 86-98. -   48. Persidsky Y, Ramirez S H, Haorah J, et al. Blood-brain barrier:     structural components and function under physiologic and pathologic     conditions. J Neuroimmune Pharmacol, 2006, 1: 223-236. -   49. Reijerkerk A, Kooij G, van der Pol S M, et al. Tissue-type     plasminogen activator is a regulator of monocyte diapedesis through     the brain endothelial barrier. J Immunol, 2008; 181: 3567-3574. -   50. Wosik K, Cayrol R, Dodelet-Devillers A, et al. Angiotension II     controls occluding function and is required for blood-brain barrier     maintenance: relevance to multiple sclerosis. J Neurosci, 2007; 27:     9032-9042. -   51. El Asmar, Panigrahi P, Bamford P, et al. Host-dependent zonulin     secretion causes the impairment of the small intestine barrier     function after bacterial exposure. Gastroenterol, 2002; 123:     1607-1615. -   52. Balkovetz D F, Katz J. Bacterial invasion of paracellular route:     divide and conquer. Microbes Infect, 2003; 5:613-619. -   53. Kuula H et al. Local systemic responses in matrix     metalloproteinase 8-deficient mice during Porphyromonas     gingivalis-induced periodontitis. Infect Immun, 2009; 77(2):850-859. -   54. Cywes C., Wessels M. R. Group A Streptococcus tissue invasion by     CD44-mediated cell signalling. Nature, 2001; 414:648-652. -   55. Y Xu, Q Yu. E-cadherin negatively regulated CD44-hyaluronan     interaction and CD44-mediated tumor invasion and branching     morphogenesis. J Biol Chem, 2003; 278: 8661-8668. -   56. Garrote J, Gomez-Gonzalez E, Bernardo D, Arranz E, Chirdo F.     Celiac disease pathogenesis: the proinflammatory cytokine network. J     Pediatr Gastroenterol Nutr, 2008; 47(Suppl 1). -   57. Maldonado Galdeano C, Perdigon G. The probiotic bacillum     Lactobacillus casei induces activation of the mucosal immune system     through innate immunity. Clin Vaccine Immunol, 2006, 13(2):219-226. -   58. Wakabayashi H, Takakura N, Yamauchi K, et al. Modulation of     immunity-related gene expression in small intestine of mice by oral     administration of lactoferrin. Clin Vaccine Immunol, 2006;     13(2):239-245. -   59. Han S, Jeong S Y, Nam Y J, et al. Xylitol inhibits inflammatory     cytokine expression induced by lipopolysaccharides from     Porphyromonas gingivalis. Clin Diag Lab Immunol, 2005;     12(11):1285-1291. -   60. Chevrier M R, Ryan A E, Lee DY-W, et al. Boswellia carterii     extract inhibits the cytokines and promotes Th2 cytokines in vitro.     Clin Diag Lab Immunol, 2005; 575-580. -   61. Syrovets T, Biichele B, Krauss C, et al. Acetyl-boswellic acids     inhibit lipopolysaccharide-mediated TNF-alpha induction in monocytes     by direct interaction with IKB kinases. J Immunol, 2005; 174:     498-506. 

What is claimed:
 1. A method of testing a sample from a human, comprising: measuring a first signal derived from binding of a first fraction of the sample to a bacterial toxin; and measuring a second signal derived from binding of a second fraction of the sample to a native antigen, selected from at least one of (a) a gut-related antigen and (b) a blood brain barrier-related antigen.
 2. The method of claim 1, wherein the bacterial toxin comprises a lipopolysaccharide.
 3. The method of claim 2, wherein the native gut-related antigen is selected from the list consisting of: (1) an intestinal structural protein; (2) a tight junction protein; and (3) a binding receptor to the tight junction protein; and (4) a cell junction protein.
 4. The method of claim 3, wherein the blood brain barrier-related antigen is selected from the list consisting of: (1) a blood brain barrier protein; (2) a glial fibrillary acidic protein (GFAP); (3) matrix metalloproteinase (MMP), (4) a brain ZOT binding protein; (5) brain ZOT receptor; (6) a calprotectin; and (7) a myelin basic protein.
 5. The method of claim 2, wherein the intestinal structural antigen comprises actin/actomyosin.
 6. The method of claim 2, wherein the tight junction antigen is selected from the group consisting of occludin and zonulin.
 7. The method of claim 2, wherein the binding receptor comprises intestinal ZOT receptor.
 8. The method of claim 2, wherein the structural protein comprises matrix metalloproteinase-3 (MMP-3).
 9. The method of claim 1, wherein the blood brain barrier-related antigen is selected from the list consisting of: (1) a blood brain barrier protein; (2) a glial fibrillary acidic protein (GFAP); (3) matrix metalloproteinase (MMP).
 10. A method of diagnosing a disease associated with leaky gut syndrome, comprising: ordering from a laboratory a test using the method of claim 1; and analyzing the test results.
 11. A method of diagnosing a disease associated with blood brain barrier permeability, comprising: ordering from a laboratory a test using the method of claim 1; and analyzing the test results. 